1=15x-1.86x^2

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Solution for 1=15x-1.86x^2 equation:


Simplifying
1 = 15x + -1.86x2

Solving
1 = 15x + -1.86x2

Solving for variable 'x'.

Reorder the terms:
1 + -15x + 1.86x2 = 15x + -15x + -1.86x2 + 1.86x2

Combine like terms: 15x + -15x = 0
1 + -15x + 1.86x2 = 0 + -1.86x2 + 1.86x2
1 + -15x + 1.86x2 = -1.86x2 + 1.86x2

Combine like terms: -1.86x2 + 1.86x2 = 0.00
1 + -15x + 1.86x2 = 0.00

Begin completing the square.  Divide all terms by
1.86 the coefficient of the squared term: 

Divide each side by '1.86'.
0.5376344086 + -8.064516129x + x2 = 0

Move the constant term to the right:

Add '-0.5376344086' to each side of the equation.
0.5376344086 + -8.064516129x + -0.5376344086 + x2 = 0 + -0.5376344086

Reorder the terms:
0.5376344086 + -0.5376344086 + -8.064516129x + x2 = 0 + -0.5376344086

Combine like terms: 0.5376344086 + -0.5376344086 = 0.0000000000
0.0000000000 + -8.064516129x + x2 = 0 + -0.5376344086
-8.064516129x + x2 = 0 + -0.5376344086

Combine like terms: 0 + -0.5376344086 = -0.5376344086
-8.064516129x + x2 = -0.5376344086

The x term is -8.064516129x.  Take half its coefficient (-4.032258065).
Square it (16.25910510) and add it to both sides.

Add '16.25910510' to each side of the equation.
-8.064516129x + 16.25910510 + x2 = -0.5376344086 + 16.25910510

Reorder the terms:
16.25910510 + -8.064516129x + x2 = -0.5376344086 + 16.25910510

Combine like terms: -0.5376344086 + 16.25910510 = 15.7214706914
16.25910510 + -8.064516129x + x2 = 15.7214706914

Factor a perfect square on the left side:
(x + -4.032258065)(x + -4.032258065) = 15.7214706914

Calculate the square root of the right side: 3.965030982

Break this problem into two subproblems by setting 
(x + -4.032258065) equal to 3.965030982 and -3.965030982.

Subproblem 1

x + -4.032258065 = 3.965030982 Simplifying x + -4.032258065 = 3.965030982 Reorder the terms: -4.032258065 + x = 3.965030982 Solving -4.032258065 + x = 3.965030982 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.032258065' to each side of the equation. -4.032258065 + 4.032258065 + x = 3.965030982 + 4.032258065 Combine like terms: -4.032258065 + 4.032258065 = 0.000000000 0.000000000 + x = 3.965030982 + 4.032258065 x = 3.965030982 + 4.032258065 Combine like terms: 3.965030982 + 4.032258065 = 7.997289047 x = 7.997289047 Simplifying x = 7.997289047

Subproblem 2

x + -4.032258065 = -3.965030982 Simplifying x + -4.032258065 = -3.965030982 Reorder the terms: -4.032258065 + x = -3.965030982 Solving -4.032258065 + x = -3.965030982 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.032258065' to each side of the equation. -4.032258065 + 4.032258065 + x = -3.965030982 + 4.032258065 Combine like terms: -4.032258065 + 4.032258065 = 0.000000000 0.000000000 + x = -3.965030982 + 4.032258065 x = -3.965030982 + 4.032258065 Combine like terms: -3.965030982 + 4.032258065 = 0.067227083 x = 0.067227083 Simplifying x = 0.067227083

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.997289047, 0.067227083}

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